PM8805TR - ST Microelectronics

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

PM8805TR
Manufacturer

ST Microelectronics
ChipWorker Part#

CW52522104
Package

QFN
Description

Power Over Ethernet PD Controller 43Pin VFQFPN EP
Documentation

Datasheet

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PM8805TR Specifications

Attribute	Attribute Value

Part Number	PM8805TR
Manufacturer	ST Microelectronics
ChipWorker Part#	CW52522104
Documentation	Datasheet
Number of Pins	43 Pin
Case/Package	QFN
Output Current	2 A
Supply Current	15 µA
Number of Channels	2 Channel
Number of Positions	43 Position
Input Power (Max)	99.9 W
Operating Temperature (Max)	85 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage	9V ~ 57V
Input Voltage	57 V
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Operating Temperature	-40℃ ~ 85℃ (TA)
Product Lifecycle Status	Active
Packaging	Tape & Reel (TR)
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
ECCN Code	EAR99

Product Description

The PM8805 is a system in package for Power over Ethernet (PoE) and powered devices (PD) applications. It embeds: two active bridges and their driving circuitry, a charge pump to drive high-side MOSFETs, the hot-swap MOSFET and the standard single-signature interface IEEE 802.3bt-compliant, including detection, classification, UVLO and inrush current limitation. The active bridges sustain up to 1 A current and the hot-swap MOSFET is designed to safely work up to 2 A. The device performs IEEE 802.3bt physical layer classification scheme, providing the system with an indication of successful PSE-type. The device identifies a 4-pair PSE, monitoring the pairs of the Ethernet cable and providing the system with a dedicated matrix of Tx signals. The device works with power either from the Ethernet cable or from an external power source such as a wall adapter, with the likelihood of the auxiliary source being prevalent over PoE. The device is suitable to build the interface section of PoE switch mode power supplies targeting the highest conversion efficiency. It provides a PGD signal that can be used to enable a PWM controller, a DC-DC converter or a LED driver.
**Key Features**
System in package:
Dual-active-bridge with 100 V MOSFETs and 0.2 Ω total path resistance
100 V, 0.1 Ω hot-swap MOSFETs
PoE-PD single-signature interface, IEEE 802.3af/at/bt (draft 2.3)-compliant
Detection and support of high power, 4-pair applications
Support 12 V auxiliary sources
Identifies which kind of PSE (standard or legacy) is connected and provides successful IEEE802.3 af/at/bt classification indications as combination of T0, T1 and T2 signals (open-drain)
Smart operational mode selection by command signals: STBY, RAUX and FAUX
Programmable classification current with 3.3 ms delay
Autoclass feature (optional)
Advanced energy-saving MPS timings
Hot-swap current protection in two steps: DC with 1 ms delay and short-circuit with 10 μs delay
Start-up phase (pre-charge of the output capacitor) due to an internally limited current source
PGD signal (open-drain) to enable an external PWM controller
Thermal shutdown protection
VFQFPN package with 6 exposed pads

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